Signature of an h1 state from J/ψ → ηK*0K̄*0 and theoretical description of the Zc(3900) and Zc(4020) as DD̄* and D* D̄* molecular states
E. Oset, Ju Jun Xie, M. Albaladejo, F. Aceti, M Bayar, J.M. Dias, A. Martinez Torres, K. Khemchandani, M. Nielsen, F. Navarra, X.L. Ren, L.S. Geng, Jie Meng and W. H. Liang